University of Wisconsin Hospital and Clinics, Madison, Wis.

KRT file photo

Percentage of workers paid by the hour: 74 "Shift flexibility is key, with many employees sharing and switching schedules," Owens said. "On average, most hourly workers stay for a decade." (Above: Doctors watch a monitor during a procedure at the University of Wisconsin Hospital in Madison in 2006.)

Percentage of workers paid by the hour: 74 "Shift flexibility is key, with many employees sharing and switching schedules," Owens said. "On average, most hourly workers stay for a decade." (Above: Doctors watch a monitor during a procedure at the University of Wisconsin Hospital in Madison in 2006.) (KRT file photo)

Percentage of workers paid by the hour: 74 "Shift flexibility is key, with many employees sharing and switching schedules," Owens said. "On average, most hourly workers stay for a decade." (Above: Doctors watch a monitor during a procedure at the University of Wisconsin Hospital in Madison in 2006.)